US 2002/0162700 A1Published application

Steering system for a vehicle

AssigneeDaimlerChrysler AG

InventorsMartin Moser, Reinhold Schneckenburger

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Abstract

A vehicle with a steering handle, which can be actuated by a driver of the vehicle, with at least one steerable vehicle wheel, which is actuated as a function of actuations of the steering handle, with a control system, which allows operation of the steering system on a steer-by-wire level and on a fall-back level and, at least in an emergency, switches from the steer-by-wire level to the fall-back level, with an electric and/or electronic coupling device, which couples the steering handle to the steerable vehicle wheel on the steer-by-wire level, and with a hydraulic and/or mechanical coupling device, which couples the steering handle to the steerable vehicle wheel on the fall-back level. In order to increase the safety of the vehicle with this kind of a steering system, the steering system is designed in such a way that the coupling between the steering handle and the steerable vehicle wheel is performed as a function of at least one first coupling coefficient on the steer-by-wire level and as a function of at least one second coupling coefficient on the fall-back level, the coupling coefficients each being formed as a function of at least one operating parameter of the vehicle and/or of the steering system, and these functions being formed in such a way that a difference between the coupling coefficients is smaller than a limiting difference from a limiting value of the operating parameter onwards.

Claims10

Dependent claims

A steering system for a vehicle, said system comprising:

a steering handle actuated by a driver of a vehicle, wherein the steering handle can be set at an angle;
at least one steerable vehicle wheel, wherein said at least one vehicle wheel is set at angles which are a function of actuations of the steering handle;
a control system for operating said steering system on a steer-by-wire level and on a fall-back level wherein said control system controllably switches from the steer-by-wire level to the fall-back level at least during an emergency;
an electrical coupling device for coupling the steering handle to the steerable vehicle wheel on the steer-by-wire level;
at least one of a hydraulic and mechanical coupling device for coupling the steering handle to the steerable vehicle wheel on the fall-back level wherein the coupling between the steering handle and the steerable vehicle wheel is preformed as a function of at least one first coupling coefficient (k1) on the steer-by-wire level and as a function of at least one second coupling coefficient (k11) on the fall-back level with each of said first and second coupling coefficients being formed as a function of at least one operating parameter (p) of the vehicle or the steering system with the function being formed in such a way that a difference between said first and second coupling coefficients is smaller than a limiting difference (Δ) for all values of the operating parameter (p) greater than a limiting value (p0).

2 more elements

Dependencies are inferred from the claim text.